I do speak Japanese, in fact! If you have a way for me to get ahold of your localized script and the original Japanese to refer it to, I'd be more than happy to read through it and offer up suggestions, small grammar fixes, etc. I can also look specifically at any remaining trouble spots, if you have any left at this point in the game.
Just let me know what I should do to get started and I'll get right to work!
- Merkabah